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Given the symptoms - my immediate thought is one of the stick coils - a primary - has failed. Unfortunately the ECU doesn't store misfire codes.. so you can't diagnose this with the GS-911. The factory way to diagnose it is to replace the coils one at a time with known good ones. Have a friend nearby with a hexhead? Ask if you can visit and swap coils one at a time.
FWIW - someone else recently had the same symptoms (a search should turn it up) - and a new coil fixed it. The stick coils live in a very hot environment and are really run close to their limit. Having them fail isn't a surprise since they do it with regularity on German automobiles..
I did ride thru very bad storms that last day, it sure seems possible that I got some contaminated gas in the tank, so will try the HEET first and keep your appraised!
That will work - it will likely cause the engine to run rougher if the coil is good - or stall. The steppers should try to maintain the idle speed. The one that doesn't cause a change in the engine running quality IS the bad one.To troubleshoot a potentially bad stick coil - catch it in the act, then just unplug the little harness connector at the top of the coil. If that doesn't cause the engine to drop idle RPM, that coil is bad.